electrical questions

[jeepmedic]

ok first i have very little experience in vehicle wiring. but heres the deal i want to simplify some of my wiring in my jeep so that I can try to waterproof some of it. but what are relays and what are they for? also i want to make a push button start can i just simply run power wires to the starter and the switch. and same with the fuel pump can i just run the power wire right to it with a switch in it. also i am going to put 2 batteries in the back, do i just run a wire up front to where the batt was for all the engine componets? but this is enough to get me started i will have alot more questions on this when i can remember them, (Its 0446 am and there is 1 patient in the er so i am bored). none the less thanks.

[BlueXJ]

Too many questions to answer in a short post. I will deal with relays.

A relay is an electrically operated switch. Electric current through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts. The coil current can be on or off so relays have two switch positions (they are double-throw).

So in other words and most importantly you do not need to run high amprere wiring to switches and such under your dash or console, just use a relay.

[4.3LXJ]

The next item is the starter switch. Yes you can run a push button switch to the starter relay on the inner fender by the battery.

[cheap jeep]

We have run fuel pumps on demolition derby cars this way and start buttons also.You can buy a heavy duty switch for the starter or run a relay(horn/light relay),about$4.50 at auto supply stores(wiring instructions on back of container).I've never done this to a daily driver,but I don't see why you couldn't.HTH

[4.3LXJ]

YOu don't need much switch if you tie into the stock starter relay.

[4.3LXJ]

The next item is the fuel pump relay. According to my wiring diagram it is not controlled by the ECM, so it could be wired to a switch also. However Blue is the expert here on Renix

[Voldemort]

I have some screwed up wiring in my project XJ right now cause of the '95 ZJ motor I put in and I have a push button start and all I did was run a hot wire off the starter to a button in the cab. I sure you can do the same with the fuel pump(as in running a hot wire off it) but that would really make a mess.

[jeepmedic]

thanks so far but heres kinda my problem there are damaged wires all over the place and i dont think the previous owner knew anything about electrical either so there are relay that are melted and in strange places so i dont know what is where so i want to elimiante as much of the wiring as possiable and kinda know what there are because i put them there not to mention put in a place where hopefully i can try to water seal it. but i am going to put the batts in the back so would it be easier to just tear out all the wiring well what i can and start over starting with the fuel and starter. i just kinda need to know if its gonna be torn up by not putting in relays and also what wiring might need to go where.

btw this is a project not a daily driver!! so other wiring suggusts for simplifiing the wiring would be great. i will be taking off the doors so i am pulling out all the wires that go to them because it is a mess from the previous owner!

[jeepmedic]

k another queston if a relay is like a switch, what is a solinoid? what are they for?

[4.3LXJ]

A solenoid is just another name for a heavy duty relay

[jeepmedic]

ok i think i got something for my wiring problems, i will pull the steering column wiring completely, then do the follow accoring to the diagram, (i am not the most skilled artist) but does any one see a problem w the diagram?

http://i106.photobucket.com/albums/m254/madmatt_04/wiring.jpg

btw i forgot but there will be a complete master switch between the batts and the solinoid.

plus the ignition would be a hei distributer so i elimanate it though the fuse box.

[4.3LXJ]

First suggestion is that you need to use a continuous duty solenoid for this. Second, your solenoid should be your battery switch. Other than that, it would work as drawn.

[jeepmedic]

ok i got another question on electrical parts.
what is this
http://i106.photobucket.com/albums/m254/madmatt_04/100_0370.jpg
http://i106.photobucket.com/albums/m254/madmatt_04/100_0371.jpg
i found it on the back of the bottom panel of the dash right where i am pointing
http://i106.photobucket.com/albums/m254/madmatt_04/100_0372.jpg

also this
http://i106.photobucket.com/albums/m254/madmatt_04/100_0373-1.jpg
it is connnected to the wires that come out of the steering colum.
thanks

[4.3LXJ]

The last pic is the wiper delay.

[Mudderoy]

http://i106.photobucket.com/albums/m254/madmatt_04/100_0370.jpg


This is the heart of your automatic transmission in the early Cherokee (XJ), and Comanche (MJ), should also work with Wrangler (YJ) too. It is located inside your vehicle under the dash, very simple to change if you are having shifting difficulty. Pulled out of a 6cyl 4.0. The part number is 8953005305 A 12V, AC 251321, 89B, the plug end says: AC9200804, your numbers will vary, not sure which ones though so I threw 'em all up there. Check with Chrysler to see exactly how expensive these units are new, then prepare to scream, because they are nearly five hundred dollars new....This unit has never been used, looking for $75, trades welcome.

:link: (http://www.snort4x4.com/forum/showthread.php?p=344948)

I just did a google search using the part number from your picture. :thumbsup:

[YellowSub2000]

While researching information for another post i did, I found this website. It's got some really good information on relays. It even has a set up you can play with. Very good.

Relay Write-up (http://www.bcae1.com/relays.htm)

[jeepmedic]

k if that is for the transmission, what else do the ecm control other then igniton?